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How to change your Core Keeper server settings and Game ID

Core KeeperUpdated Sep 24, 20263 min read

Core Keeper keeps its settings in a single file, ServerConfig.json. Everything from the Game ID to the world seed is in there.


1. Open the file

  1. Stop the server in the Game Panel.
  2. Open the Files tab and find ServerConfig.json in the dedicated server data folder. If it does not exist, start the server once and stop it again.

2. The settings that matter

SettingWhat it does
gameIdThe code players paste to join. Set your own so it never changes.
worldNameThe name of the world.
worldSeedThe seed used when a world is first generated.
worldIndex or worldWhich world slot the server loads.
maxNumberPlayersPlayer slots.
worldModeThe world type, for example normal, hard or creative.
seasonOverrideForces a seasonal event on or off.

3. Setting a permanent Game ID

A generated Game ID changes if the config is reset, and then nobody can find your server. Setting your own avoids that.

  • It must be at least 28 characters long.
  • It cannot contain the digit zero.
  • It cannot contain punctuation. Letters and numbers only.
  • Keep it short enough to fit in the join box in game.

Pick something long and unguessable. Anyone with the Game ID can join a server that has no other protection.


4. Save and restart

  1. Save the file. It must stay valid JSON. A trailing comma or a missing quotation mark stops the server loading it.
  2. Start the server and check the console for the Game ID and world name.

5. The seed only applies to a new world

Changing worldSeed does nothing to a world that already exists. The terrain has been generated and saved. To use a new seed, point the server at a world slot that has not been used yet, which leaves your existing world on disk untouched.

If a setting does not apply, confirm the server was stopped when you saved and that the file is still valid JSON.

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